linux-hardening - [PATCH] scripts/gcc-plugins: consistently use HOSTCC

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Date:   Thu, 23 Sep 2021 16:28:11 +0100
From:   Ross Burton <ross.burton@....com>
To:     linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     keescook@...omium.org
Subject: [PATCH] scripts/gcc-plugins: consistently use HOSTCC

The GCC plugins are built using HOSTCC, but the path to the GCC plugins
headers is obtained using CC.  This can lead to interesting failures if
the host compiler and cross compiler are different versions, and the
host compiler uses the cross headers.

Signed-off-by: Ross Burton <ross.burton@....com>
---
 scripts/gcc-plugins/Kconfig  | 2 +-
 scripts/gcc-plugins/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
index ab9eb4cbe33a..5dad6d780138 100644
--- a/scripts/gcc-plugins/Kconfig
+++ b/scripts/gcc-plugins/Kconfig
@@ -9,7 +9,7 @@ menuconfig GCC_PLUGINS
 	bool "GCC plugins"
 	depends on HAVE_GCC_PLUGINS
 	depends on CC_IS_GCC
-	depends on $(success,test -e $(shell,$(CC) -print-file-name=plugin)/include/plugin-version.h)
+	depends on $(success,test -e $(shell,$(HOSTCC) -print-file-name=plugin)/include/plugin-version.h)
 	default y
 	help
 	  GCC plugins are loadable modules that provide extra features to the
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index 1952d3bb80c6..a55363f84e19 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -19,7 +19,7 @@ targets += randomize_layout_seed.h randomize_layout_hash.h
 
 always-y += $(GCC_PLUGIN)
 
-GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
+GCC_PLUGINS_DIR = $(shell $(HOSTCC) -print-file-name=plugin)
 
 plugin_cxxflags	= -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
 		  -include $(srctree)/include/linux/compiler-version.h \
-- 
2.25.1